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The publisher of the books authored by the US National Academy of Sciences, the National Academy of Engineering, the Institute of Medicine, and the National Research Council makes more than 4,000 of those books available free as PDF files.
Offers journals, magazines, and reference books. Search all of these databases at once: ABI/Inform Trade & Industry, ProQuest Family Health, Research Library, ProQuest Newspapers - including the New York Times and Washington Newsstand.